 /*******************************************************************************
  * Copyright (c) 2000, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.registry;

 /**
  * An object which has the general characteristics of all the nestable elements
  * in a plug-in manifest.
  * <p>
  * This class may be subclassed.
  * </p>
  */

 public abstract class NestedRegistryModelObject extends RegistryModelObject {
     private RegistryModelObject parent;

     /**
      * Returns the plug-in model (descriptor or fragment) in which this extension is declared.
      *
      * @return the plug-in model in which this extension is declared
      * or <code>null</code>
      */
     public Object getParent() {
         return parent;
     }

     /**
      * Sets the plug-in model in which this extension is declared.
      *
      * @param value the plug-in model in which this extension is declared.
      * May be <code>null</code>.
      */
     public void setParent(RegistryModelObject value) {
         parent = value;
     }

     ExtensionRegistry getRegistry() {
         return parent == null ? null : parent.getRegistry();
     }
 }
